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Risk Management Activities - Commodity Derivative Instruments Not Designated as Hedging Instruments (Details) - Non-hedge - Commodity risk management
Dec. 31, 2024
MWh
J
t
Dec. 31, 2023
J
MWh
t
Electricity    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 47,593,000 54,043,000
Notional amount purchased 8,416,000 12,628,000
Natural Gas    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold | J 2,122,000 50,949,000
Notional amount purchased | J 79,194,000 209,348,000
Transmission    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 0 0
Notional amount purchased 292,000 856,000
Emissions    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 167,000 212,000
Notional amount purchased 370,000 804,000
Notional amount sold | t 1,850,000 4,450,000
Notional amount purchased | t 150,000 5,125,000
Coal    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold | t 0 0
Notional amount purchased | t 1,728,000 5,172,000